You may choose not to untap Phyrexian Gremlins during your untap step.
{T}: Tap target artifact. It doesn't untap during its controller's untap step for as long as Phyrexian Gremlins remains tapped.
Near Mint - $1.30
Near Mint Non-English - $1.30
Lightly Played - $1.20
Lightly Played Non-English - $1.20
Played - $0.90
Played Non-English - $0.90
Heavily Played - $0.80
Heavily Played Non-English - $0.80
Damaged - $0.70
Damaged Non-English - $0.70